Questions
Frequently asked questions
PlatformWhat is SYNTHESERACT?
The adaptive peptide synthesis platform — the physical execution layer of CFSPPS™: modular resin-bed reactors, pumps, a thermal system, reagent banks, sensors and fluidics, built so the chemistry moves through an observable process environment rather than a black box with a paddle.
ProcessWhat is CFSPPS?
Continuous-flow solid-phase peptide synthesis — the process layer. The resin stays within a contained reaction bed while precisely prepared chemical streams travel through it, residue by residue: meter, activate, mix, thermally condition, flow, monitor, wash to a defined clearance condition, deprotect, advance.
ControlWhat does S3Pulse do?
S3Pulse™ is the control architecture — deterministic machine state, valve sequencing, pump commands, flow verification, thermal control, interlocks, abort sequences, shutdown latch, guarded idle and restart eligibility. It does not merely run the machine. It knows its state.
IntelligenceWhat is Dicoias Ψ?
The analytical layer — prediction before the run, observation during, memory after. It integrates sequence context, process history and sensor behaviour, and reasons with its own uncertainty in view. It advises within explicitly authorised boundaries and never overrides an interlock.
MakerWho develops SYNTHESERACT?
Panacea Bio Chem Ltd — the company of biochemist and amino-acid-chain designer Bogdan Dicoias. SYNTHESERACT™, CFSPPS™, S3Pulse™ and Dicoias Ψ are his intellectual property.
ScopeIs this a product datasheet?
No. This page is an architecture and capability description. Practical synthesis performance is sequence- and chemistry-dependent, and nothing here is medical advice.
Peptide SynthesisWhat is the difference between Fmoc and Boc peptide synthesis?
Fmoc and Boc are two protecting-group strategies for peptide synthesis. Fmoc is removed under basic conditions, while Boc is acid-labile. Modern automated SPPS commonly uses Fmoc chemistry, although Boc remains valuable for specialist sequences and applications. The choice changes protecting groups, reagents and cleavage chemistry. — sources: PubMed — Fmoc Solid-Phase Peptide Synthesis, PubMed — Advances in Fmoc solid-phase peptide synthesis
Peptide SynthesisWhat is peptide synthesis resin?
Resin is the insoluble polymer support used to anchor the first amino acid and the growing peptide during SPPS. Resin chemistry, linker and loading influence swelling, solvent access, final C-terminal functionality and synthesis performance, so resin choice is a central process variable. — sources: PubMed — Fmoc Solid-Phase Peptide Synthesis
Peptide SynthesisWhy does resin swelling matter in SPPS?
Coupling and deprotection reagents must diffuse through the swollen resin to reach the growing peptide chains. Poor swelling or local aggregation can reduce reagent access and create incomplete reactions. Solvent, resin type, loading and peptide sequence therefore affect synthesis efficiency. — sources: PubMed — Fmoc Solid-Phase Peptide Synthesis, PubMed — SPPS: difficult sequences
Peptide SynthesisWhat is coupling in peptide synthesis?
Coupling is the reaction that forms the next peptide bond by joining an activated amino-acid building block to the growing peptide chain. High coupling efficiency is essential because incomplete coupling can create deletion sequences that persist through later synthesis steps. — sources: PubMed — Fmoc Solid-Phase Peptide Synthesis, PubMed — SPPS: difficult sequences
Peptide SynthesisWhat is deprotection in peptide synthesis?
Deprotection removes a temporary protecting group so the next reactive site becomes available for chain extension. In Fmoc-SPPS, the N-terminal Fmoc group is removed before each new coupling. Incomplete deprotection can stall or corrupt subsequent synthesis cycles. — sources: PubMed — Fmoc Solid-Phase Peptide Synthesis
Peptide SynthesisWhat is capping in peptide synthesis?
Capping deliberately blocks peptide chains that failed to react in a coupling step so they cannot continue growing into closely related deletion impurities. It can simplify downstream impurity profiles, although process strategy depends on the synthesis and desired product. — sources: PubMed — Fmoc Solid-Phase Peptide Synthesis
Peptide SynthesisWhat is final cleavage in SPPS?
Final cleavage releases the completed peptide from the resin and usually removes acid-labile side-chain protecting groups at the same time. Cleavage conditions must be chosen to release the target efficiently while limiting side reactions and damage to sensitive residues or modifications. — sources: PubMed — Fmoc Solid-Phase Peptide Synthesis
Peptide SynthesisWhat is a difficult peptide sequence?
A difficult sequence is one that becomes poorly solvated, aggregates or forms secondary structure during synthesis, making deprotection and coupling incomplete. Hydrophobic and aggregation-prone sequences are common examples. Difficult sequences often require changes in resin, solvent, temperature, coupling strategy or temporary backbone-disrupting modifications. — sources: PubMed — SPPS: difficult sequences, PubMed — Highly hydrophobic/difficult peptide synthesis
Peptide SynthesisWhy does on-resin aggregation reduce peptide synthesis quality?
When growing chains self-associate on the resin, reactive sites become less accessible to deprotection and coupling reagents. That creates incomplete reactions and more deletion or truncated impurities. Aggregation can therefore make an otherwise routine sequence progressively harder to assemble as it lengthens. — sources: PubMed — SPPS: difficult sequences, PubMed — Highly hydrophobic/difficult peptide synthesis
Peptide SynthesisWhy do longer peptides become harder to synthesize?
Stepwise synthesis compounds small inefficiencies: if every coupling is slightly below quantitative, the fraction of full-length product falls as residue count increases. Longer chains are also more likely to aggregate or form secondary structure. High cycle efficiency and process monitoring therefore become increasingly important with length. — sources: PubMed — Fmoc Solid-Phase Peptide Synthesis, PubMed — SPPS: difficult sequences
Peptide SynthesisWhat is double coupling and why is it used?
Double coupling repeats a coupling reaction when a single cycle may not reach adequate conversion. It can improve incorporation of difficult residues or sequences, but it increases reagent use and does not solve every root cause. Monitoring should determine where repetition is actually needed. — sources: PubMed — SPPS: difficult sequences
Peptide SynthesisHow can peptide synthesis be monitored during SPPS?
SPPS can be monitored through signals associated with deprotection or coupling, test reactions, UV absorbance and analytical sampling. Monitoring helps identify incomplete chemistry or the onset of difficult-sequence behaviour rather than discovering the problem only after final cleavage. — sources: PubMed — Advances in Fmoc solid-phase peptide synthesis, PubMed — SPPS: difficult sequences
Peptide SynthesisWhat is continuous-flow peptide synthesis?
Continuous-flow peptide synthesis moves reagents through a reaction environment in a controlled flow rather than relying only on repeated batch contact. Modern flow approaches can accelerate heating, mixing, reagent exchange and monitoring, and have been demonstrated from rapid laboratory synthesis to large-scale applications. — sources: PubMed — Continuous-flow peptide synthesis review
Peptide SynthesisHow does continuous-flow SPPS differ from batch SPPS?
In batch SPPS, resin and reagents are mixed for discrete reaction periods before draining and washing. In continuous-flow SPPS, reagents are delivered through or across the resin bed in a controlled stream. Flow can improve heat/mass transfer and automation, but pressure drop, resin behaviour, reagent consumption and scale-up must be engineered carefully. — sources: PubMed — Continuous-flow peptide synthesis review, PubMed — SPPS: difficult sequences
